Smart Card PCB Pre-Package for Non-Planar Component Protection
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Solution Overview
Problem
Existing smartcard manufacturing methods face challenges in efficiently incorporating non-planar electronic components while ensuring mechanical robustness, tamper resistance, and adherence to size standards, with current approaches leading to potential damage and complex insertion processes.
Innovation Solution
A pre-package structure for a flexible printed circuit board in smartcards, comprising a flexible printed circuit board encapsulated by three layers of dielectric materials with varying VICAT softening temperatures, including a hardening layer to prevent deformation during lamination, ensuring mechanical protection and planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete electronic components with non-planar configuration are incorporated into smartcards, then superior functionality is provided, but significant efforts are required for incorporation and mechanical robustness is compromised
Solution Approach 1:
The electronic components are preliminarily encapsulated in a pre-package structure before being incorporated into the smartcard. This pre-encapsulation protects the components during handling and insertion, preventing damage while maintaining the ability to incorporate various non-planar components for superior functionality
Solution Approach 2:
A pre-package structure acts as an intermediary between the electronic components and the smartcard substrate. This intermediate structure provides mechanical protection and a standardized interface, allowing various non-planar components to be incorporated without compromising the overall mechanical robustness of the smartcard
2Reliability
If multiple compensation layers are added to encapsulate non-planar components, then mechanical protection is improved, but the number of layers increases and size requirements are difficult to meet
Solution Approach 1:
The pre-package structure merges the encapsulation function with the component mounting structure into a single integrated unit. This consolidation provides mechanical protection without requiring multiple separate compensation layers, thereby reducing the overall layer count and meeting size requirements
3Productivity
If electronic components are directly incorporated into the card body, then production efficiency is improved, but the components are susceptible to damage during usage
Solution Approach 1:
Electronic components are preliminarily encapsulated in a pre-package structure before incorporation into the smartcard. This preliminary protection ensures component integrity during usage while maintaining production efficiency through standardized pre-package units that can be efficiently integrated
4Reliability
If pre-package structure with many layers is used to protect electronic components, then mechanical robustness is improved, but it is difficult to meet smartcard size requirements
Solution Approach 1:
The pre-package structure merges multiple functions (encapsulation, mounting, and mechanical support) into a single integrated unit, eliminating the need for separate compensation layers. This consolidation maintains mechanical robustness while reducing the overall footprint to meet smartcard size requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pre-package structure provides enhanced mechanical robustness and flexibility, meeting ISO standards while protecting electronic components and simplifying the insertion process, with a reduced number of layers and optimized surface levelling.
Implementation Method 1
the third layer has a third VICAT softening temperature, wherein the third VICAT softening temperature is higher than the first VICAT softening temperature and/or than the second VICAT softening temperature
Data Source
AI summary
The present invention refers to a pre-package for a flexible printed circuit board for a smartcard. The pre-package comprises a flexible printed circuit board including one or more non-planar circuit portions; a first layer of a first material at least partially covering a first side of the flexible printed circuit board so as to form a planar layer; a second layer of a second material covering a second side of the flexible printed circuit board; and a third layer comprising a hardening material at least partially covering the first side so as to form a planar layer. The third layer has a third hardness value which is higher than the first hardness value and/or than the second hardness value of the first and second dielectric materials, respectively. The pre-package may be advantageously inserted into a smartcard having a suitable window for accommodating the pre-package comprising the electronic components. The present invention also refers to the methods for forming the pre-package and the smartcard comprising it.